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All Journal JFA (Jurnal Fisika dan Aplikasinya) Journal of Natural Sciences and Mathematics Research Magnetic: Research Journal of Physics and It’s Application Newton-Maxwell Journal of Physics Physical Sciences, Life Science and Engineering
Achmad, Arifin
Department Of Physics, Universitas Jenderal Soedirman
Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemistry Earth & Planetary Sciences Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences

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Review Perumusan Teori Kapasitas Panas Einstein-Debye Menggunakan Integral Lintasan Feynman Achmad, Arifin; Muflihatun; Fadli, Rizqi
Physical Sciences, Life Science and Engineering Vol. 2 No. 1 (2024): December
Publisher : Indonesian Journal Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47134/pslse.v2i1.321

Abstract

Teori Einstein-Debye memberikan deskripsi mekanika kuantum tentang kalor jenis zat padat, khususnya pada suhu rendah. Secara tradisional, teori ini telah dirumuskan menggunakan kuantisasi mode getaran dalam kisi kristal. Dalam artikel ini, kami menyajikan formulasi teori Einstein-Debye dengan menggunakan integral lintasan Feynman. Formulasi ini memberikan gambaran yang lebih mendalam tentang mekanika statistik kuantum getaran kisi, yang menawarkan kerangka kerja terpadu untuk memperoleh kalor jenis zat padat. Dengan menggunakan integral lintasan, kami mengeksplorasi kontribusi berbagai mode getaran dan pengaruhnya terhadap sifat termodinamika zat padat, yang memberikan perspektif baru tentang model Einstein dan Debye dalam satu teori yang koheren.
Quantum Square Wells with Capacitive Walls: A Toy Model for Quantum Capacitors Achmad, Arifin
Jurnal Fisika dan Aplikasinya Vol 21, No 2 (2025)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v21i2.22083

Abstract

This research aims to determine the energy quantization in a one-dimensional infinite square well modified by capacitive walls. The electric field inside the wall produces a linear potential. The solution to the Schrödinger equation is the Airy function for an infinite square well. Furthermore, the Wentzel–Kramers–Brillouin (WKB) approach is applied to finite wells, and the energy quantization for both cases based on this modified potential has been derived. In this paper, we also examine the quantum capacitance of the system, which is determined from the density of states and depends on dimensionality. The results obtained show that there is compatibility between the simple model that we work on and several systems, for example, graphene-base system.
Pembangkitan Massa Partikel Neutrino dengan Fermion Triplet Melalui Mekanisme Seesaw Tipe III Ety Kurniati; Kadek Ayu Cintya Adelia; Arifin Achmad; Luqman Hakim
Magnetic: Research Journal of Physics and It’s Application Vol. 5 No. 2 (2025): Magnetic: Research Journal of Physics and It’s Application
Publisher : Program Studi Fisika - Universitas San Pedro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59632/magnetic.v5i2.626

Abstract

Neutrino merupakan partikel yang sangat ringan, tidak memiliki muatan dan interaksi dengan materi lainnya sangat lemah. Massa partikel neutrino dalam pembahasan ini dibangkitkan dengan fermion triple melalui mekanisme seesaw III. Mekanisme Seesaw merupakan salah satu mekanisme untuk membangkitkan massa partikel neutrino yang tidak tercakup dalam Model Standar (MS) fisika partikel.  Hal ini berarti bahwa mekanisme seesaw merupakan alternatif dari MS. Kajian dalam artikel ini bersifat teoritis dan didukung oleh studi literatur. Massa partikel neutrino dapat terbentuk secara konsisten dengan menganalisis peran fermion triplet dalam Lagrangian menggunakan mekanisme Seesaw tipe III.  
Estimasi Koreksi Relativistik pada Efisiensi Mesin Carnot dalam Kerangka Non-Inersia Achmad, Arifin; Muflihatun; Pratiwi, Sulistiyani Hayu
Newton-Maxwell Journal of Physics Vol. 6 No. 2: Oktober 2025
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/nmj.v6i2.41104

Abstract

This paper investigates relativistic corrections to the efficiency of Carnot engines in non-inertial frames, focusing on massive objects such as neutron stars and black holes.  The results of this study show that, in non-inertial frames, the local temperature and the efficiency of Carnot engines are influenced by rotation and linear acceleration. Using a relativistic approach, it is found that the efficiency correction depends on the acceleration and angular velocity parameters. Simulation results indicate that relativistic corrections become significant under extreme conditions, such as rapidly rotating neutron stars of about 10-4 to 10-3 or in strong gravitational fields around black holes of about O (1). This paper does not examine in detail the mass distribution, magnetic field effects on rotating neutron stars, or quantum effects on black holes. Instead, it focuses on estimating the Tolman temperature correction for non-inertial frames.
Seismicity analysis of the Southern Java region (2020-2024) based on the b-value and a-value using the maximum Likelihood method Apriyanti, Syafrida Dwi; Fatmasari, Nurvita; Wijayanto, Mirda Prisma; Achmad, Arifin; Muflihatun
Journal of Natural Sciences and Mathematics Research Vol. 11 No. 2 (2025): December
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/jnsmr.v11i2.27765

Abstract

This study investigates the seismicity analysis of the Southern Java region using earthquake data obtained from BMKG Banjarnegara, comprising 1064 events recorded between 2020 and 2024. The study area spans coordinate 7.5°S-8.5°S and 108.31°E-109.50°E. The analysis was conducted using Microsoft Excel, ZMAP 7.0, and QGIS 3.28.2 to calculate the a-value and b-value, key parameters that describe the frequency and magnitude distribution of earthquakes. The magnitude of 2.6 was the most frequently observed, with 150 recorded events, while earthquakes occurring at a depth of 10 km were the most common, totaling 210 events. The high density of seismic occurrences reflects significant tectonic activity in the region. Using the maximum likelihood method, the b-value was determined to be approximately 1.09 ± 0.04, and the a-value was calculated at 5.754. The relatively low b-value suggests areas of elevated stress, implying potential for larger-magnitude earthquakes. Additionally, the spatial distribution of the a-value highlights regions of heightened seismic activity. These findings contribute to a deeper understanding of seismic behavior in Southern Java and offer valuable insights to support disaster risk reduction and earthquake mitigation efforts in the region.
Co-Authors Apriyanti, Syafrida Dwi Ety Kurniati Fadli, Rizqi Fatmasari, Nurvita Kadek Ayu Cintya Adelia Luqman Hakim Mirda Prisma Wijayanto Muflihatun Pratiwi, Sulistiyani Hayu